Flat panel display device, stereoscopic display device, and plasma display device

ABSTRACT

The present invention provides a flat panel display device, which includes a backlight system and a display panel. The backlight system includes a light source, a light homogenization mechanism, and a back frame. The back frame carries the light source and the light homogenization mechanism, and the light homogenization mechanism guides light from the light source into the display panel. The back frame includes primary assembling pieces, secondary assembling pieces, and a bracing piece for fixing a circuit board. The at least two primary assembling pieces are connected through joining and the two primary assembling pieces use different thermally conductive materials. Further, the primary assembling piece includes a joint section that forms a reinforcement structure and a circuit board is mountable and position adjustable through a bracing piece. The present invention also provides a stereoscopic display device and a plasma display device. The back frame and the backlight system of the present invention have a back frame of simple structure, reduce the expenditure of a back frame mold, facilitate heat dissipation, allow strength of the back frame to meet a desired requirement, improve fixing of circuit board, and save the material used for back frame so as to lower down the manufacturing cost of flat panel display device.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of displaying techniques, andin particular to a flat panel display device, a stereoscopic displaydevice, and a plasma display device.

2. The Related Arts

The state-of-the-art liquid crystal display device comprises a frontbezel, a panel, and a backlight module, of which the backlight modulecomprises a back frame, a reflector plate, a light guide, and a lightingassembly.

Currently, a variety of display panels of different sizes are availablein the market to meet different needs of general consumers. For example,in the field of television set, the sizes of liquid crystal panelsinclude 31.5, 42, 46, 48, and 55 inches. Different back frame molds areprovided for liquid crystal planes of different sizes.

Referring to FIG. 1, FIG. 1 is a schematic view showing a conventionalback frame of liquid crystal display device. As shown in FIG. 1, theconventional back frame 10 is a unitary back frame, and it is often thata unitary back frame 10 is made with metal stamping or plastic injectionmolding. The unitary back frame 10 consumes much material and has a highmaterial cost. Further, a large-sized back frame 10 requires large-sizedstamping equipment, and the size of mold corresponding to such a backframe 10 is large and the structure complicated, making the expenditureof the back frame mold high. As a consequence, the conventional backframe is of a high cost.

SUMMARY OF THE INVENTION

The technical issue to be addressed by the present invention is toprovide a flat panel display device, a stereoscopic display device, anda plasma display device, which lower down material cost and mold cost,facilitate heat dissipation, allow the strength of the back frame tomeet a desired requirement, and improve fixing of circuit board.

To address the above technical issue, the present invention adopts atechnical solution that provides a flat panel display device, whichcomprises a backlight system and a display panel; the backlight systemcomprises a light source, a light homogenization mechanism, and a backframe; the back frame carries the light source and the lighthomogenization mechanism, the light homogenization mechanism guidinglight from the light source into the display panel; the back framecomprises primary assembling pieces, secondary assembling pieces, and abracing piece for fixing a circuit board; the primary assembling pieceshave a number of at least two, at least one of the primary assemblingpieces having an end forming a joint section, the at least two primaryassembling pieces being joined through the corresponding joint sections,the secondary assembling pieces being connected to the primaryassembling pieces through joining; at least one of the primaryassembling pieces comprises a reinforcement structure formed on thejoint section thereof; the at least two primary assembling piecescomprise a primary assembling piece that has a heat source arrangedthereon, the primary assembling piece that has the heat source arrangedthereon having a first heat transfer capability, the remaining one ormore primary assembling pieces of the at least two primary assemblingpieces that have no heat source arranged thereon having a second heattransfer capability, the first heat transfer capability being greaterthan the second heat transfer capability; the bracing piece comprises abracing body, a first suspension section, a first bearing section, and afirst resilient bent section, the bracing body being fixed to theprimary assembling pieces or the secondary assembling pieces or both ofthe primary assembling pieces and the secondary assembling pieces,wherein available mounting points between the bracing piece and theprimary assembling pieces or the secondary assembling pieces are of anumber of at least two so that the bracing piece is selectively mountedto the back frame at different positions; and the first suspensionsection extends from the bracing body in a lengthwise direction of thebracing body, the first bearing section being spaced from the bracingbody and extending from the first suspension section in a lengthwisedirection of the first suspension section, the first resilient bentsection being located between the first bearing section and the bracingbody and being bent from the first suspension section in a lengthwisedirection of the first suspension section, the first bearing section andthe first resilient bent section resiliently clamping a first side edgeof the circuit board.

According to a preferred embodiment of the present invention, the atleast two primary assembling pieces comprises a first primary assemblingpiece and a second primary assembling piece.

According to a preferred embodiment of the present invention, the jointsections comprise recesses formed in a surface of the first primaryassembling piece and having a shape corresponding to the end of thesecond primary assembling piece for receiving the end of the secondprimary assembling piece.

According to a preferred embodiment of the present invention, the firstprimary assembling piece forms a first through hole in a bottom thereof,a second through hole being formed in the second primary assemblingpiece at a corresponding position, the back frame comprising a fastener,the fastener extending through the first through hole and the secondthrough hole to joint the first primary assembling piece and the secondprimary assembling piece.

According to a preferred embodiment of the present invention, the jointsections comprise recesses formed in the surface of the first primaryassembling piece, the second primary assembling piece having an endhaving a surface forming protrusions at corresponding positions, theprotrusions being receivable in the recesses to join the first primaryassembling piece and the second primary assembling piece to each other.

According to a preferred embodiment of the present invention, each ofthe primary assembling pieces has a cross-section of the joint sectionthat has a line-folded configuration in order to form the reinforcementstructure, the line-folded configuration comprising at least two joinedline segments, the reinforcement structures of the two primaryassembling pieces being stacked in a recess-projection paired form.

According to a preferred embodiment of the present invention, each ofthe primary assembling pieces has a cross-section of the joint sectionthat is an arc shape to form the reinforcement structure, thereinforcement structures of the two primary assembling pieces beingstacked in a recess-projection paired form.

According to a preferred embodiment of the present invention, theprimary assembling piece that has the heat source arranged thereon has afirst strength, the remaining one or more primary assembling pieces ofthe at least two primary assembling pieces that have no heat sourcearranged thereon having a second strength, the second strength beinggreater than the first strength.

According to a preferred embodiment of the present invention, theprimary assembling piece that has the first heat transfer capability andthe first strength is an aluminum piece and the primary assemblingpieces that have the second heat transfer capability and the secondstrength are galvanized steel pieces.

According to a preferred embodiment of the present invention, thebracing body forms at least two through holes that are spaced in thelengthwise direction of the bracing body, the secondary assembling piecebeing mountable to any one of the at least two through holes and thebracing body being fixed to the secondary assembling piece.

According to a preferred embodiment of the present invention, thebracing piece comprises at least two bracing members, wherein at leastone of the bracing members is mountable to the primary assembling piecein a lengthwise of the primary assembling piece and the other one of thebracing members forms at least two through hole that are spaced in thelengthwise direction of the bracing piece, the primary assembling piecebeing mountable to any one of the at least two through holes.

According to a preferred embodiment of the present invention, thebracing piece further comprises a second suspension section, a secondbearing section, and a second resilient bent section, the secondsuspension section being spaced from the first suspension section andextending from the bracing body in a lengthwise direction of the bracingbody, the second bearing section being spaced from the bracing body andextending from the second suspension section in a lengthwise directionof the second suspension section, the second resilient bent sectionbeing located between the second bearing section and the bracing bodyand extending from the second suspension in a lengthwise direction ofthe second suspension section, the second bearing section and the secondresilient bent section resiliently clamping the circuit board.

According to a preferred embodiment of the present invention, the twobracing members clamp different positions of a first side edge and asecond side edge of the circuit board.

According to a preferred embodiment of the present invention, thebracing body is of a step-like configuration and bridges between two ofthe primary assembling pieces, or two of the secondary assemblingpieces, or between the primary assembling piece and the secondaryassembling piece.

According to a preferred embodiment of the present invention, the backframe comprises a third primary assembling piece and a fourth primaryassembling piece; and the first primary assembling piece, the secondprimary assembling piece, the third primary assembling piece, and thefourth primary assembling piece are straight linear and are joined in aleading end-to-tailing end manner to form a rectangular main framestructure enclosing the back frame.

According to a preferred embodiment of the present invention, thesecondary assembling pieces comprise a first secondary assembling pieceand a second secondary assembling piece, the first secondary assemblingpiece having two ends respectively joined to at least two primaryassembling pieces of the first primary assembling piece, the secondprimary assembling piece, the third primary assembling piece, and thefourth primary assembling piece, the second secondary assembling piecehaving two ends respectively joined to at least two primary assemblingpieces of the first primary assembling piece, the second primaryassembling piece, the third primary assembling piece, and the fourthprimary assembling piece.

According to a preferred embodiment of the present invention, the twoends of the first secondary assembling piece are respectively joined tothe first primary assembling piece and the second primary assemblingpiece that are adjacent to each other and the two ends of the secondsecondary assembling piece are respectively joined to the third primaryassembling piece and the fourth primary assembling piece that areadjacent to each other; or the two ends of the first secondaryassembling piece are respectively joined to the first primary assemblingpiece and the third primary assembling piece that are opposite to eachother and the two ends of the second secondary assembling piece arerespectively joined to the first primary assembling piece and the thirdprimary assembling piece that are opposite to each other, the secondprimary assembling piece, the fourth primary assembling piece, the firstsecondary assembling piece, and the second secondary assembling piecebeing arranged parallel to each other.

According to a preferred embodiment of the present invention, the backframe comprises at least one bracing piece, which is releasably fixed toone or more of the first primary assembling piece, the second primaryassembling piece, the third primary assembling piece, the fourth primaryassembling piece, the first secondary assembling piece, and the secondsecondary assembling piece, the bracing piece forming a bump.

According to a preferred embodiment of the present invention, the flatpanel display device comprises a touch screen and the touch screen ispositioned on a light exit surface of the display panel.

To address the above technical issue, the present invention adopts atechnical solution that provides a stereoscopic display device. Thestereoscopic display device comprises a liquid crystal lens grating, abacklight system, and a display panel, the liquid crystal lens gratingbeing arranged on a light exit surface of the display panel; thebacklight system comprises a light source, a light homogenizationmechanism, and a back frame; the back frame carries the light source andthe light homogenization mechanism, the light homogenization mechanismguiding light from the light source to a light incidence surface of thedisplay panel; the back frame comprises primary assembling pieces,secondary assembling pieces, and a bracing piece for fixing a circuitboard; the primary assembling pieces have a number of at least two, atleast one of the primary assembling pieces having an end forming a jointsection, the at least two primary assembling pieces being joined throughthe corresponding joint sections, the secondary assembling pieces beingconnected to the primary assembling pieces through joining; at least oneof the primary assembling pieces comprises a reinforcement structureformed on the joint section thereof; the at least two primary assemblingpieces comprise a primary assembling piece that has a heat sourcearranged thereon, the primary assembling piece that has the heat sourcearranged thereon having a first heat transfer capability, the remainingone or more primary assembling pieces of the at least two primaryassembling pieces that have no heat source arranged thereon having asecond heat transfer capability, the first heat transfer capabilitybeing greater than the second heat transfer capability; the bracingpiece comprises a bracing body, a first suspension section, a firstbearing section, and a first resilient bent section, the bracing bodybeing fixed to the primary assembling pieces or the secondary assemblingpieces or both of the primary assembling pieces and the secondaryassembling pieces, wherein available mounting points between the bracingpiece and the primary assembling pieces or the secondary assemblingpieces are of a number of at least two so that the bracing piece isselectively mounted to the back frame at different positions; and thefirst suspension section extends from the bracing body in a lengthwisedirection of the bracing body, the first bearing section being spacedfrom the bracing body and extending from the first suspension section ina lengthwise direction of the first suspension section, the firstresilient bent section being located between the first bearing sectionand the bracing body and being bent from the first suspension section ina lengthwise direction of the first suspension section, the firstbearing section and the first resilient bent section resilientlyclamping a first side edge of the circuit board.

To address the above technical issue, the present invention adopts atechnical solution that provides a plasma display device, whichcomprises a plasma display panel and a back frame, the back frame beingarranged at a back side of the plasma display panel; the back framecomprises primary assembling pieces, secondary assembling pieces, and abracing piece for fixing a circuit board; the primary assembling pieceshave a number of at least two, at least one of the primary assemblingpieces having an end forming a joint section, the at least two primaryassembling pieces being joined through the corresponding joint sections,the secondary assembling pieces being connected to the primaryassembling pieces through joining; at least one of the primaryassembling pieces comprises a reinforcement structure formed on thejoint section thereof; the at least two primary assembling piecescomprise a primary assembling piece that has a heat source arrangedthereon, the primary assembling piece that has the heat source arrangedthereon having a first heat transfer capability, the remaining one ormore primary assembling pieces of the at least two primary assemblingpieces that have no heat source arranged thereon having a second heattransfer capability, the first heat transfer capability being greaterthan the second heat transfer capability; the bracing piece comprises abracing body, a first suspension section, a first bearing section, and afirst resilient bent section, the bracing body being fixed to theprimary assembling pieces or the secondary assembling pieces or both ofthe primary assembling pieces and the secondary assembling pieces,wherein available mounting points between the bracing piece and theprimary assembling pieces or the secondary assembling pieces are of anumber of at least two so that the bracing piece is selectively mountedto the back frame at different positions; and the first suspensionsection extends from the bracing body in a lengthwise direction of thebracing body, the first bearing section being spaced from the bracingbody and extending from the first suspension section in a lengthwisedirection of the first suspension section, the first resilient bentsection being located between the first bearing section and the bracingbody and being bent from the first suspension section in a lengthwisedirection of the first suspension section, the first bearing section andthe first resilient bent section resiliently clamping a first side edgeof the circuit board.

The efficacy of the present invention is that to be distinguished fromthe state of the art, the present invention provides a flat paneldisplay device, a stereoscopic display device, and a plasma displaydevice that comprises at least two primary assembling pieces. The jointsection of the primary assembling piece forms a reinforcement structurein order to improve the strength of joining. The primary assemblingpieces use different thermally conductive materials. Further, a circuitboard is mountable through a bracing piece so that a mold for back frameis made simple in structure, the expenditures of the back frame mold andthe back frame are reduced, the strength of the back frame can meet adesired requirement, heat dissipation is facilitated, fixing of circuitboard is improved, and the manufacturing cost of flat panel displaydevice is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing a conventional back frame of liquidcrystal display device;

FIG. 2 is a schematic view showing a flat panel display device accordingto a first embodiment of the present invention;

FIG. 3 is a schematic view showing a back frame of a flat panel displaydevice according to a second embodiment of the present invention;

FIG. 4 is a cross-sectional view of a first embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 5 is a cross-sectional view of a second embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 6 is a cross-sectional view of a third embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 7 is a cross-sectional view of a fourth embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 8 is a cross-sectional view of a fifth embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 9 is a cross-sectional view of a sixth embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 10 is a cross-sectional view of a seventh embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 11 is a cross-sectional view of an eighth embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 12 is a cross-sectional view of a ninth embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 13 is a cross-sectional view of a tenth embodiment of a jointsection of a primary assembling piece taken along line A-A′ of FIG. 3;

FIG. 14 is a schematic view showing another structure of thereinforcement structure of the back frame shown in FIG. 3;

FIG. 15 is a schematic view showing a back frame of a flat panel displaydevice according to a third embodiment of the present invention;

FIG. 16 is a schematic view showing a back frame of a flat panel displaydevice according to a fourth embodiment of the present invention;

FIG. 17 is a schematic view showing a joining structure of a flat paneldisplay device according to a fifth embodiment of the present invention;

FIG. 18 is a schematic view showing a diagonally-arranged firstsecondary assembling piece mounted to a main frame structure of a flatpanel display device according to a sixth embodiment of the presentinvention;

FIG. 19 is a schematic view showing a first secondary assembling pieceand a second secondary assembling piece mounted to a main framestructure of a flat panel display device according to a seventhembodiment of the present invention;

FIG. 20 is a schematic view showing joint sections of a back frame of aflat panel display device according to an eighth embodiment of thepresent invention;

FIG. 21 is a cross-sectional view showing a first embodiment of jointsection of FIG. 20;

FIG. 22 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aninth embodiment of the present invention;

FIG. 23 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to atenth embodiment of the present invention;

FIG. 24 is a schematic view showing a joining structure of a jointsection of a back frame of a flat panel display device according to aneleventh embodiment of the present invention;

FIG. 25 is a schematic view showing a joint section of a back frame of aflat panel display device according to a twelfth embodiment of thepresent invention;

FIG. 26 is a schematic view showing a joint section of a back frame of aflat panel display device according to a thirteenth embodiment of thepresent invention;

FIG. 27 is a schematic view showing a back frame of a flat panel displaydevice according to a fourteenth embodiment of the present invention;

FIG. 28 is a schematic view showing a flat panel display deviceaccording to a fifteenth embodiment of the present invention;

FIG. 29 is a schematic view showing a back frame of flat panel displaydevice;

FIG. 30 is a flow chart showing a method for manufacturing a back frameof a flat panel display device according to a sixteenth of the presentinvention;

FIG. 31 is a schematic view showing a flat panel display device with atouch screen according to a seventeenth embodiment of the presentinvention;

FIG. 32 is a schematic view showing a stereoscopic display deviceaccording to an eighteenth embodiment of the present invention;

FIG. 33 is a schematic view showing a plasma display device according toa nineteenth embodiment of the present invention;

FIG. 34 is a schematic view showing a portion of a back frame of a flatpanel display device according to a twentieth embodiment of the presentinvention;

FIG. 35 is an enlarged view showing a mounting site of a bracing memberof a back frame and an assembling piece shown in FIG. 34;

FIG. 36 is a cross-sectional view showing the mounting site of thebracing member of the back frame and the assembling piece shown in FIG.34;

FIG. 37 is an enlarged view showing a mounting site of another bracingmember of the back frame and another assembling piece shown in FIG. 34;

FIG. 38 is a cross-sectional view showing the mounting site of saidanother bracing member of the back frame and said another assemblingpiece shown in FIG. 34;

FIG. 39 is an enlarged view showing a mounting site of two bracingmembers of a back frame shown in FIG. 34;

FIG. 40 is a cross-sectional vie showing the mounting site of the twobracing members of the back frame shown in FIG. 34;

FIG. 41 is a schematic view showing a portion of a back frame of a flatpanel display device according to a twenty-first embodiment of thepresent invention;

FIG. 42 is a schematic view showing a portion of a back frame of a flatpanel display device according to a twenty-second embodiment of thepresent invention; and

FIG. 43 is a cross-sectional view showing a bracing piece of the backframe of FIG. 42 and a circuit board.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 2-3, FIG. 2 is a schematic view showing a flat paneldisplay device according to a first embodiment of the present inventionand FIG. 3 is a schematic view showing a back frame of a flat paneldisplay device according to a second embodiment of the presentinvention. As shown in FIG. 2, the flat panel display device 20according to the instant embodiment comprises: a backlight system 21 anda display panel 22. The backlight system 21 is arranged on a back sideof the display panel 22 and supplies light to the display panel 22.

In the instant embodiment, the backlight system 21 comprises a lightsource 25, a light homogenization mechanism 24, and a back frame 23. Theback frame 23 carries the light source 25 and the light homogenizationmechanism 24. When the backlight system 21 is an edge lighting type, thelight homogenization mechanism 24 is a light guide; and when thebacklight system 21 is a direct type, the light homogenization mechanism24 is a diffuser plate. The back frame 23 comprises at least a firstprimary assembling piece and a second primary assembling piece, and thetwo of at least first and second primary assembling pieces constitute amain frame structure 27 of the back frame 23.

Referring also to FIG. 3, the back frame 23 of the first embodimentcomprises a first primary assembling piece 261 and a second primaryassembling piece 262. The first primary assembling piece 261 has an endjoined to an end of the second primary assembling piece 262, and thefirst primary assembling piece 261 has another end joined to another endof the second primary assembling piece 262 in order to form the mainframe structure 27 of the back frame 23. The first primary assemblingpiece 261 and the second primary assembling piece 262 are both aluminumpieces or galvanized steel pieces. In the instant embodiment, the firstprimary assembling piece 261 and the second primary assembling piece 262are L-shaped.

Further referring to FIG. 3, in the instant embodiment, the firstprimary assembling piece 261 comprises a joint section 2611 and thesecond primary assembling piece 262 comprises a joint section 2612. Atleast one of the first primary assembling piece 261 and the secondprimary assembling piece 262 comprises a reinforcement structure on thejoint section thereof. In other words, the reinforcement structure isarranged on at least the joint section 2611 or the joint section 2612.

An example that the joint section 2611 and the joint section 2612 areboth provided with a reinforcement structure will be described.

The joint section 2611 and the joint section 2612 have a cross-sectionthat has a line-folded configuration in order to form a reinforcementstructure. The line-folded configuration comprises at least two joinedline segments. For example, the line-folded configuration of thereinforcement structure may be a rectangle (as shown in FIG. 4, in whichcircled by phantom lines is a stacked recess-projection paired form), atrapezoidal (as shown in FIG. 5), a swallow-tailed shape (as shown inFIG. 6), an inverted T-shape (as shown in FIG. 7), a conic shape (asshown in FIG. 8), a wavy shape (as shown in FIG. 9), a grating shape (asshown in FIG. 10), or may alternatively be a T-shape, a cruciform shape,or a fork-like shape. The reinforcement structure of the joint section2611 of the first primary assembling piece 261 and the reinforcementstructure of the joint section 2621 of the second primary assemblingpiece 262 are stacked in a recess-projection paired form.

Alternatively, the joint section 2611 and the joint section 2621 mayhave a cross-section that is an arc shape to form the reinforcementstructure. When the cross-section is an arc shape, the arc shape can beone or more groups of single curvature (as shown in FIG. 11), dualcurvatures (as shown in FIG. 12) or multiple curvatures (as shown inFIG. 13). The reinforcement structure of the joint section 2611 of thefirst primary assembling piece 261 and the reinforcement structure ofthe joint section 2621 of the second primary assembling piece 262 arestacked in a recess-projection paired form.

It is apparent that the shape of the cross-section that can be used toform a reinforcement structure is not limited to these and any can beused provided the strength of the reinforcement structure is improved.Further, it is noted that in all the embodiments of joint section ofprimary assembling piece shown in FIGS. 5-13, except FIG. 5 showing theshapes of the reinforcement structure of the joint section 2611 and thereinforcement structure of the joint section 2621 and therecess-projection stacking between the two reinforcement structures, theremaining drawings show only the shape of the reinforcement structure ofone of the joint section 2611 or 2612 and the recess-projection stackingis not illustrated.

Referring to FIG. 14, which is a schematic view showing anotherstructure of the reinforcement structure provided on the joint section2621, the reinforcement structure comprises a plate layer 2623. Theplate layer 2623 functions to thicken the joint section 2621, with thejoint section 2611 being stacked on the joint section 2621.

It is appreciated that the embodiments of the present invention employ ajoining operation to form a back frame in order to simplify thestructure of the back frame and save the material used for the backframe so as to reduce the manufacturing cost of a backlight displaydevice. Meanwhile, through the arrangement of reinforcement structure ona joint section of a primary assembling piece, the strength of the jointsite of the back frame can be improved to thereby ensure the overallstrength of the back frame meets desired requirement.

It is noted all the embodiments of the reinforcement structure describedabove are also applicable to various embodiments of back frame,backlight system, and flat panel display device.

Referring also to FIG. 15, the back frame 23 of a second embodimentcomprises a first primary assembling piece 281, a second primaryassembling piece 282, and a third primary assembling piece 283. Thethree primary assembling pieces 281, 282, and 283 are assembled andjoined to form a main frame structure 27 of the back frame 23. The threeprimary assembling pieces 281, 282, and 283 are all aluminum pieces orgalvanized steel pieces. In the instant embodiment, the first primaryassembling piece 281 is L-shaped, and the second and third primaryassembling pieces 282, 283 are straight linear.

Further, the back frame 23 further comprises secondary assembling piecesarranged inside and joined to the main frame structure 27.

A detailed description will be given to the back frame 23 of the flatpanel display device 20 according to the present invention, whichcomprises four primary assembling pieces and two secondary assemblingpieces.

Referring to FIG. 16, FIG. 16 is a schematic view showing a back frameof flat panel display device according to a fourth embodiment of thepresent invention. As shown in FIG. 16, in the instant embodiment, aback frame 23 comprises: a first primary assembling piece 231, a secondprimary assembling piece 232, a third primary assembling piece 233, afourth primary assembling piece 234, a first secondary assembling piece235, a second secondary assembling piece 236, and bracing pieces 2371,2372, 2373, 2374, 2375, 2376, and 2377. The first primary assemblingpiece 231, the second primary assembling piece 232, the third primaryassembling piece 233, and the fourth primary assembling piece 234 aresuccessively joined to each other in an end-to-end manner to constitutea rectangular main frame structure 27 of the back frame 23. The firstsecondary assembling piece 235 and the second secondary assembling piece236, serving as ancillary assembling pieces, are arranged in the mainframe structure 27 and joined to the main frame structure 27.

Specifically, an end of the first primary assembling piece 231 is joinedto an end of the second primary assembling piece 232, another end of thesecond primary assembling piece 232 is joined to an end of the thirdprimary assembling piece 233, another end of the third primaryassembling piece 233 is joined to an end of the fourth primaryassembling piece 234, and another end of the fourth primary assemblingpiece 234 is joined to another end of the first primary assembling piece231 in order to form the rectangular main frame structure 27. The firstprimary assembling piece 231, the second primary assembling piece 232,the third primary assembling piece 233, and the fourth primaryassembling piece 234 are all aluminum pieces or galvanized steel pieces.In the instant embodiment, the first primary assembling piece 231, thesecond primary assembling piece 232, the third primary assembling piece233, and the fourth primary assembling piece 234 are straight linear,yet in other embodiments, it is apparent to those skilled in the art tomake all the first primary assembling piece 231, the second primaryassembling piece 232, the third primary assembling piece 233, and thefourth primary assembling piece 234 L-shaped, or some being straightlinear and the remaining being L-shaped. For example, in FIG. 3, thefirst primary assembling piece 261 and the second primary assemblingpiece 262 are both L-shaped; in FIG. 4, the first primary assemblingpiece 281 is L-shaped, while the second and third primary assemblingpieces 282 and 283 are straight linear.

In the instant embodiment, the back frame 23 of the flat panel displaydevice 20 is formed by joining connection. As shown in FIG. 17, anillustrative example is given for the connection of an end of the firstprimary assembling piece 231 to an end of the second primary assemblingpiece 232, wherein the end of the second primary assembling piece 232 isjoined to the end of the first primary assembling piece 231 by means offor example screwing, fastening, or welding, to have the end of thesecond primary assembling piece 232 connected to the end of the firstprimary assembling piece 231.

In the instant embodiment, the first secondary assembling piece 235 andthe second secondary assembling piece 236 are arranged in the main framestructure 27 of the back frame 23. An end of the first secondaryassembling piece 235 is joined to the first primary assembling piece 231and another end of the first secondary assembling piece 235 is joined tothe third primary assembling piece 233; and an end of the secondsecondary assembling piece 236 is joined to the first primary assemblingpiece 231 and another end of the second secondary assembling piece 236is joined to the third primary assembling piece 233. Further, the secondprimary assembling piece 232, the fourth primary assembling piece 234,the first secondary assembling piece 235, and the second secondaryassembling piece 236 are arranged parallel to each other. In otherembodiments, those skilled in the art may arrange at least one secondaryassembling piece in the main frame structure 27. For example, only thefirst secondary assembling piece 235 is arranged in the main framestructure 27. Further, the two ends of the first secondary assemblingpiece 235 can be selectively joined to at least two of the primaryassembling pieces of the first primary assembling piece 231, the secondprimary assembling piece 232, the third primary assembling piece 233,and the fourth primary assembling piece 234. For example, the firstsecondary assembling piece 235 is set diagonally in the main framestructure 27, as shown in FIG. 7. Similarly, the two ends of the secondsecondary assembling piece 236 can be selectively joined to at least twoof the primary assembling pieces of the first primary assembling piece231, the second primary assembling piece 232, the third primaryassembling piece 233, and the fourth primary assembling piece 234. Forexample, the two ends of the first secondary assembling piece 235 arerespectively joined to the first primary assembling piece 231 and thesecond primary assembling piece 232 that are adjacent to each other andthe two ends of the second secondary assembling piece 236 arerespectively joined the third primary assembling piece 233 and thefourth primary assembling piece 234 that are adjacent to each other, asshown in FIG. 19.

In the instant embodiment, the back frame 23 comprises seven bracingpieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377. The bracing piece2371 is fixed to the fourth primary assembling piece 234; the bracingpieces 2372, 2373 are both fixed to the first secondary assembling piece235; the bracing piece 2374 is fixed to the second secondary assemblingpiece 236; the bracing piece 2375 is fixed to the second primaryassembling piece 232; and the bracing pieces 2376, 2377 are each fixed,at two ends thereof, to the first secondary assembling piece 235 and thesecond secondary assembling piece 236. In practice, the bracing piecescan be fixed to one or more of the first primary assembling piece 231,the second primary assembling piece 232, the third primary assemblingpiece 233, the fourth primary assembling piece 234, the first secondaryassembling piece 235, and the second secondary assembling piece 236. Inother embodiments, those skilled in the art may mount bracing pieces ofany other numbers to the back frame 23, such as one or more bracingpieces. Further, the bracing pieces can be releasably fixed to one ormore of the first primary assembling piece 231, the second primaryassembling piece 232, the third primary assembling piece 233, the fourthprimary assembling piece 234, the first secondary assembling piece 235,and the second secondary assembling piece 236.

The bracing pieces 2371, 2372, 2373, 2374, 2375, 2376, and 2377 may beprovided with bumps (not labeled) so that the back frame 23 may fixcomponents, such as circuit boards, with such bumps.

Molds for making the back frame 23 will be described. In the instantembodiment, the first primary assembling piece 231 and the third primaryassembling piece 233 are of the same size and shape so that they can bemade by stamping with the same mold. The second primary assembling piece232, the fourth primary assembling piece 234, the first secondaryassembling piece 235, and the second secondary assembling piece 236 areof the same size and shape so that they can be made by stamping with thesame mold, making it possible to share the mold. Thus, the back frame 23of the present invention can be made by stamping with only twosmall-sized molds, and compared to the conventional back frame 10 thatrequires a large-sized mold, the molds for making the back frame 23 ofthe present invention are simple in structure and small in size and thusthe cost of mold for the back frame 23 can be lowered. Further, comparedto the whole back frame structure of the conventional back frame 10, theback frame 23 of the present invention can significantly save materialused and thus reduce the manufacturing cost of the flat panel displaydevice 20.

Referring to FIG. 20, FIG. 20 is a schematic view showing joint sectionsof a back frame of a flat panel display device according to an eighthembodiment of the present invention. As shown in FIG. 20, in the instantembodiment, an end of the first primary assembling piece is providedwith two joint sections, and the joint sections have a structure matingan end of the second primary assembling piece so that the first primaryassembling piece can be joined to a corresponding end of the secondprimary assembling piece.

Specifically, the first primary assembling piece 231 has an end formingjoint sections 2311, 2312, and the joint sections 2311, 2312 arearranged in a spaced manner in a lengthwise direction of the firstprimary assembling piece 231. The joint sections 2311, 2312 are formedby forming recesses having a shape mating an end of the second primaryassembling piece 232 in the first primary assembling piece 231 in orderto receive the end of the second primary assembling piece 232 therein.As shown in FIG. 21, the joint sections 2311, 2312 are recesses that donot extend through opposite surfaces of the end of the first primaryassembling piece 231 and the recesses are of a rectangular shape withthe second primary assembling piece 232 being straight linear.

To assemble a large-sized back frame 23, the joint section 2311 that isclose to the very end of the first primary assembling piece 231 is firsttaken and a second primary assembling piece 232 having a correspondingwidth is selected. Afterwards, an end of the second primary assemblingpiece 232 is positioned in the recess of the joint section 2311. Andthen, means, such as screwing, fastening, or welding, is applied to joinand fix the end of the second primary assembling piece 232 to the jointsection 2311. To assemble a small-sized back frame 23, the joint section2312 that is distant from the very end of the first primary assemblingpiece 231 is first chosen and a second primary assembling piece 232having a corresponding width is selected. Afterwards, an end of thesecond primary assembling piece 232 is positioned in the recess of thejoint section 2312. And then, means, such as screwing, fastening, orwelding, is applied to join and fix the end of the second primaryassembling piece 232 to the joint section 2312. Specifically, forexample the second primary assembling piece 232 forms a protrusion at acorresponding location on a surface thereof, and the protrusion of thesecond primary assembling piece 232 is embedded in the recess the firstprimary assembling piece 231 at a corresponding location in order tojoin the first primary assembling piece 231 and the second primaryassembling piece 232, as shown in FIG. 11. Further, the second primaryassembling piece 232 may form, on one end thereof, at least twoprotrusions that are spaced in the lengthwise direction of the secondprimary assembling piece 232, such as two, three, or four protrusions.

Furthermore, the recess of the first primary assembling piece 231 can bea recess of a multi-stepped configuration and the second primaryassembling piece 232 forms, at a corresponding location, a protrusionhaving a multi-stepped configuration corresponding to the recess, asshown in FIG. 23. Further, as shown in FIG. 24, taking the joint section2311 as an example, the recess of the first primary assembling piece 231forms, in a bottom thereof, a first through hole 2313, and the secondprimary assembling piece 232 forms, at a location corresponding to thejoint section 2311, a second through hole 2321. The back frame 23further comprises a fastener 240. The fastener 240 extends through thefirst through hole 2313 and the second through hole 2321 to joint thefirst primary assembling piece 231 and the second primary assemblingpiece 232 to each other.

As shown in FIG. 25, in another embodiment of the back frame of flatpanel display device according to the present invention, the recesses ofthe joint sections 2311, 2312 of the first primary assembling piece 231are of a circular shape. Yet, in other embodiments, those skilled in theart may arrange the shape of the recesses to be other polygonalconfigurations, such as triangle.

As shown in FIG. 26, in another embodiment of the back frame of flatpanel display device according to the present invention, the jointsections 2311, 2312 are recesses that do not extend through oppositesurfaces of the first primary assembling piece 231, whereby an end ofthe second primary assembling piece 232 is movable within the jointsections 2311, 2312. For example, after the end of the second primaryassembling piece 232 is set extending beyond and joined and fixed to thejoint section 2312, the portion of extension is then trimmed off so thatthe length of the second primary assembling piece 232 that serves as aprimary assembling piece of the back frame can be adjusted.

In a practical application, the other end of the first primaryassembling piece 231 and both ends of the third primary assembling piece233 are all provided with two joint sections having a structureidentical to that of the joint sections 2311, 2312. The ends of thesecond primary assembling piece 232 and the ends of the fourth primaryassembling piece 234 may be subjected to specific designs or no designat all according to the application. For example:

(1) In a first situation, as shown in FIG. 21, the two ends of thesecond primary assembling piece 232 and the two ends of the fourthprimary assembling piece 234 are of no specific design. In other words,the ends are of the same structure as the remaining portions. Under thiscondition, in making a join with a selected joint section 2311 (2312) atone end of the first primary assembling piece 231 (the same applicableto the other end), if an attempt is made to change the width of the backframe 23, then the length of the corresponding second primary assemblingpiece 232 and fourth primary assembling piece 234 must be selectedaccordingly. Namely, if the joint section 2311 that is close to the veryend of the first primary assembling piece 231 is selected for joining,then no trimming is applied to the second primary assembling piece 232and the fourth primary assembling piece 234 or the portion that istrimmed off is short; if the joint section 2312 that is distant from thevery end of the first primary assembling piece 231 is selected forjoining, then the second primary assembling piece 232 and the fourthprimary assembling piece 234 are trimmed and the trimmed portion beinglong or short is according to the distance that the joint section isfrom the very end of the first primary assembling piece 231 being greator small; and

(2) In a second situation, it is similar to the first situation, but asshown in FIG. 22, the second primary assembling piece 232 and the fourthprimary assembling piece 234 use different protrusions to respectivelymate the first primary assembling piece 231 and the third primaryassembling piece 233 in order to realize change of width of the backframe 23; similarly, if a joint section 2312 other than the first jointsection 2311 that is close to the very end of the first primaryassembling piece 231 is selected for joining, then before or afterjoining, excessive portions of the second primary assembling piece 232and the fourth primary assembling piece 234 may be trimmed off.

This also applicable to a main frame structure 27 of the back frame 23that is formed by joining two L-shaped primary assembling pieces.

In summary, the present invention provides a back frame 23 having afirst primary assembling piece that is provided with at least two jointsections. The number of the joint section can be selected according tothe requirement of customers. In the instant embodiment, a descriptionis given to an example comprising two joint sections 2311, 2312. Thus,to prepare the molds for making the back frame 23, only two sets of moldare needed, namely one mold for a first primary assembling piece and theother mold for a second primary assembling piece. The first primaryassembling piece may be provided with a plurality of joint sections forjoining operation in order to form various sizes for the back frame 23.To assemble the back frame 23, based on the desired size of the backframe 23, the corresponding one of the joint sections is selected. Withthe joint section, the second primary assembling piece is joined to thejoint section of the first primary assembling piece and the other jointsection of the first primary assembling piece that is located outward ofthe joining location of the second primary assembling piece is trimmedoff to obtain a desired size of the back frame 23. Compared to theconventional technology that requires different back frame molds formaking different sizes of back frame 10, the back frame of the flatpanel display device 23 according to the present invention requires onlya mold for the first primary assembling piece and a mold for the secondprimary assembling piece 28 so that mold sharing among various sizes ofproduct can be realized and the molds used are of simple structures,allowing of reduction of expenditure of the molds for back frames.

Referring to FIGS. 27-28, an example of four primary assembling piecesand two secondary assembling pieces will be given to describe thedifference in material section for the primary assembling piece of theback frame 23 of the flat panel display device 20 according to thepresent invention having a heat source arranged thereon and theassembling piece having no heat source arranged thereon.

In the four primary assembling pieces and the two secondary assemblingpieces, at least two primary assembling pieces comprise the primaryassembling piece that has a heat source arranged thereon. The primaryassembling piece that has the heat source arranged thereon has a firstheat transfer capability. The remaining one or more primary assemblingpieces of the at least two primary assembling pieces that have no heatsource arranged thereon have a second heat transfer capability. Thefirst heat transfer capability is greater than the second heat transfercapability.

The heat source can be a light-emitting diode (LED), a printed circuitboard (PCB), or other electronic devices that generate heat. LED istaken an example here. A parameter that represents the heat transfercapability can be thermal conductivity. In other words, the primaryassembling piece that has a heat source arranged thereon has a thermalconductivity that is greater than the thermal conductivity of theremaining one or more primary assembling pieces that have no heat sourcearranged thereon.

The primary assembling piece that has a heat source arranged thereon hasa first strength. The remaining one or more primary assembling pieces ofthe at least two primary assembling pieces that have no heat sourcearranged thereon have a second strength. The second strength is greaterthan the first strength.

The primary assembling piece that has the first heat transfer capabilityand the first strength is an aluminum piece and the primary assemblingpieces that have the second heat transfer capability and the secondstrength are galvanized steel pieces. Certainly, besides aluminumpieces, other pieces having a better capacity of heat dissipation can becopper pieces, magnesium alloys, or open aluminum alloy foams. Besidesgalvanized steel pieces, pieces having a better strength can be organicpieces or tinned iron piece.

An example of back frame that comprises four primary assembling piecesand two secondary assembling pieces will be given as follow. As shown inFIGS. 27-28, a first primary assembling piece 291, a second primaryassembling piece 292, a third primary assembling piece 293, a fourthprimary assembling piece 294, a first secondary assembling piece 295,and a second secondary assembling piece 296 constitute a back frame. Theprimary assembling pieces that have a heat source 25 arranged thereonare the third primary assembling piece 293 and the fourth primaryassembling piece 294. The third primary assembling piece 293 and thefourth primary assembling piece 294 are made of aluminum pieces M1. Thefirst primary assembling piece 291, the second primary assembling piece292, the first secondary assembling piece 295, and the second secondaryassembling piece 296 that do no have a heat source 10125 arrangedthereon are made of galvanized steel pieces M2.

Further, the primary assembling piece that has a heat source arrangedthereon can be a stacked structure of a first layer and a second layer,of which the first layer is adjacent to the heat source and the firstlayer has a heat transfer capability that is greater than heat transfercapability of the second layer.

The first layer is adjacent to the heat source and the material of thefirst layer can be selected to have a heat transfer capability greaterthan the heat transfer capability of the material of the second layer.For example, the first layer is an aluminum piece, or a copper piece, ormagnesium alloys, or open aluminum alloy foams, and the second layer isan organic piece or tinned iron. Certainly, the primary assembling piecethat carries the heat source 10125 can be of a single layer having amaterial used to make the first layer mentioned above.

Aluminum pieces and copper pieces have better performance of heatdissipation and are advantageous in extending lifespan of product.Galvanized steel has worse performance of heat dissipation, but theprice is relatively low and strength is better. In the cost of a backframe, the material cost takes the greatest percentage. If the wholeback frame is made of a material that has a better performance of heatdissipation, such as aluminum, then the cost is extremely high and thestructural strength is poor. If it is completely made of a materialhaving poor performance of heat dissipation, such as galvanized steel,then the heat dissipation will be poor and the product performance willbe deteriorated. Thus, in practical applications, different materialsmust be used in manufacturing for different positions, such as acombination of aluminum piece and galvanized steel pieces, in order tominimize the product cost and at the same time ensure the requirementsof heat dissipation and strength are satisfied, so that the materialcost can be reduced and the product cost is lowered. Certainly, theabove embodiments of different material selection for the primaryassembling pieces are also applicable to a main frame structure that isformed by joining two L-shaped primary assembling pieces.

The present invention also provides a mold for making a back frame offlat panel display device. The back frame mold is provided with a mainpattern for forming a primary assembling piece of the back frame and themain pattern comprises a sub-pattern that forms at least two jointsections on an end of the primary assembling piece. The primaryassembling piece comprises the previously discussed first primaryassembling piece and second primary assembling piece, corresponding tothe above mentioned main pattern; and the joint section comprises thepreviously discussed joint section of the first primary assemblingpiece, corresponding to the above mentioned sub-pattern. Repeateddescription is omitted herein.

Referring to FIG. 29, a schematic view showing a back frame of flatpanel display device according to the present invention is shown, afirst primary assembling piece 261 and a second primary assembling piece262. The first primary assembling piece 261 has an end joined to an endof the second primary assembling piece 262, and the first primaryassembling piece 261 has another end joined to another end of the secondprimary assembling piece 262 in order to form the main frame structure27 of the back frame 23. The first primary assembling piece 261 and thesecond primary assembling piece 262 are both aluminum pieces orgalvanized steel pieces. In the instant embodiment, the first primaryassembling piece 261 and the second primary assembling piece 262 areL-shaped.

Referring to FIG. 3, the first primary assembling piece 261 comprises ajoint section 2611 and the second primary assembling piece 262 comprisesa joint section 2612. At least one of the first primary assembling piece261 and the second primary assembling piece 262 comprises areinforcement structure (not shown) on the joint section thereof. Inother words, the reinforcement structure is arranged on at least thejoint section 2611 or the joint section 2612.

Referring to FIG. 34, a bracing piece 60 is formed by joining bracingmembers 601, 602. Two ends of the bracing piece 60 are respectivelyfixed to assembling pieces 61, 62. The assembling pieces 61, 62 aremountable to the bracing piece 60 in at least two different positions inthe lengthwise direction of the bracing piece 60, wherein the assemblingpieces 61, 62 can be the primary assembling pieces or the secondaryassembling pieces of each of the above embodiments. In other words, thebracing piece 60 can be mounted to the primary assembling pieces or thesecondary assembling pieces, or can be mounted to both the primaryassembling pieces and the secondary assembling pieces, wherein availablemounting points between the bracing piece 60 and the primary assemblingpieces or the secondary assembling pieces are of a number of at leasttwo (corresponding to the previously mentioned two different positions),so that the bracing piece 60 can be mounted to different positions inthe back frame. In other backup embodiments, the bracing piece 60 mayhas only one end fixed to the assembling piece, while the other end isarranged in a suspending form. The bracing piece 60 may also be of aunitary design.

Referring to FIG. 42, the bracing piece 60 comprises a bracing body11161, a first suspension section 11162, a first bearing section 11163,and a first resilient bent section 11164. In other words, the bracingbody 11161 is mounted to the primary assembling pieces or the secondaryassembling pieces, or is mounted to both the primary assembling piecesand the secondary assembling pieces, wherein available mounting pointsbetween the bracing body 11161 and the primary assembling pieces or thesecondary assembling pieces are of a number of at least two so that thebracing body can be mounted to different positions in the back frame. Inthe instant embodiment, the bracing body 11161 is of a step-likeconfiguration and bridges between two assembling pieces 11171, 11172.

The present invention also provides a mold for making a back frame offlat panel display device. The back frame mold is provided with a mainpattern for forming a primary assembling piece of the back frame and themain pattern comprises a sub-pattern that forms at least two jointsections on an end of the primary assembling piece. The primaryassembling piece comprises the previously discussed first primaryassembling piece and second primary assembling piece, corresponding tothe above mentioned main pattern; and the joint section comprises thepreviously discussed joint section of the first primary assemblingpiece, corresponding to the above mentioned sub-pattern. Repeateddescription is omitted herein.

Referring to FIG. 30, the present invention also provides a method formaking a back frame of flat panel display device. The method comprisesthe following steps:

Step 501: manufacturing at least two primary assembling pieces, the atleast two primary assembling pieces comprising a primary assemblingpiece that carries a heat source. The primary assembling piece thatcarries the heat source has a first heat transfer capability, and theremaining one or more primary assembling pieces of the at least twoprimary assembling pieces that carry no heat source have a second heattransfer capability, the first heat transfer capability being greaterthan the second heat transfer capability; and

Step 502: joining the at least two primary assembling pieces.

In the instant embodiment, when other joint sections are present betweenthe joining location of the second primary assembling piece and the endof the first primary assembling piece, before or after the step ofselecting one joint section of the at least two joint sections accordingto a size of the back frame to join the corresponding end of the secondprimary assembling piece, the other joint sections of the first primaryassembling piece that are located outward of the joining position of thesecond primary assembling piece are trimmed off. The first primaryassembling piece comprises the previously discussed first primaryassembling piece, and the second primary assembling piece comprises thepreviously discussed second primary assembling piece, and repeateddescription will be omitted herein.

As shown in FIG. 22, the flat panel display device 20 of the presentinvention further comprises a touch screen 29. The touch screen 29 isarranged on a light exit surface of the display panel 22 of the flatpanel display device 20. The flat panel display device 20 comprises: thebacklight system 21 and the above discussed display panel 22. Thebacklight system 21 is arranged at the back side of the display panel 22and supplies light to the display panel 22.

The backlight system 21 comprises a light source 25, a lighthomogenization mechanism 24, and a back frame 23. The back frame 23carries the light source 25 and the light homogenization mechanism 24.When the backlight system 21 is an edge lighting type, the lighthomogenization mechanism 24 is a light guide; and when the backlightsystem 21 is a direct type, the light homogenization mechanism 24 is adiffuser plate. The back frame 23 comprises at least a first primaryassembling piece and a second primary assembling piece, and the at leastone first and second primary assembling pieces constitute a main framestructure 27 of the back frame 23.

It is apparent that the backlight system 21 can be of a structure of anyone of the previously discussed embodiments of the backlight system.

It is noted that the flat panel display device 20 of the presentinvention can be a liquid crystal display device or a liquid crystaltelevision.

The present invention also provides a stereoscopic display device 30. Asshown in FIG. 32, the stereoscopic display device 30 comprises a liquidcrystal lens grating 31, a backlight system 32, and a display panel 33.The liquid crystal lens grating 31 is arranged on a light exit surfaceof the display panel 33. The backlight system 32 can be a backlightsystem of any one of the above discussed embodiments, such as thebacklight system 32 comprising a light source (not shown), a lighthomogenization mechanism (not shown), and the back frame 23. The backframe 23 carries the light source and the light homogenizationmechanism. The light homogenization mechanism guides light from thelight source to a light incidence surface of the display panel 33. Theback frame 23 comprises at least first primary assembling piece and thesecond primary assembling piece. The at least first and second primaryassembling pieces form a main frame structure of the back frame. Thebacklight system 32 can be of a structure of any of the previouslydiscussed embodiments of backlight system and repeated description willbe omitted herein.

The present invention also provides a plasma display device 40. As shownin FIG. 33, the plasma display device 40 comprises a plasma displaypanel 41 and a back frame 42. The back frame 42 is arranged at a backside of the display panel 41. The back frame 42 can be the back frame ofany one of the previously discussed embodiments and repeated descriptionwill be omitted herein.

The present invention also provides a bracing piece that is applicableto the back frame of each of the above disclosed embodiments, whereinthe bracing piece is fixed to the assembling pieces and the assemblingpieces are mountable to at least two different positions of the bracingpiece in a lengthwise direction of the bracing piece, whereby thebracing piece is movable to make positions of bumps that are provided onthe bracing piece for positioning purposes adjustable in order to meetthe needs for different assembling requirements of the back frame.

Specifically, as shown in FIG. 34, in the instant embodiment, thebracing piece 60 is formed by joining bracing members 601, 602. Two endsof the bracing piece 60 are respectively fixed to assembling pieces 61,62. The assembling pieces 61, 62 are mountable to the bracing piece 60in at least two different positions in the lengthwise direction of thebracing piece 60, wherein the assembling pieces 61, 62 can be theprimary assembling pieces or the secondary assembling pieces of each ofthe above embodiments. In other backup embodiments, the bracing piece 60may has only one end fixed to the assembling piece, while the other endis arranged in a suspending form. The bracing piece 60 may also be of aunitary design.

Further, referring in combination to FIGS. 35-36, formed in an end ofthe bracing member 601 that is fixed to the assembling piece 61 is anelongate through hole 6011 that is arranged in the bracing member 601 inthe lengthwise direction of the bracing piece 60. The bracing member 601is fixed by a screw 63 to the assembling piece 61 of the back frame. Thescrew 63 is positionable in different locations within the elongatethrough hole 6011. Thus, in assembling, the elongate through hole 6011is put to overlap a threaded hole 611 of the assembling piece 61 andaccording to the need for mounting, the position of the bracing member601 on the assembling piece 61 is adjusted in the lengthwise directionof the bracing piece 60 so as to adjust the position of the bump 6012 ofthe bracing member 601 with respect to the assembling piece 61. Afterthe bump 6012 of the bracing member 601 has been adjusted to a desiredposition, the screw 63 is set in a corresponding position within theelongate through hole 6011 and engages the threaded hole 611 of theassembling pieces 61 to thereby fix the bracing member 601 to theassembling piece 61.

Similarly, referring in combination to FIGS. 37-38, in an end of thebracing member 602 that is fixed to the assembling piece 62, an elongatethrough hole 6021 is formed in the lengthwise direction of the bracingpiece 60. A screw 64 is positionable in different positions within theelongate through hole 6021, whereby by having the screw 64 engaging athreaded hole 621 of the assembling piece 62, the bracing member 602 isfixed to the assembling piece 62, so as to realize position adjustmentof a bump 6022 with respect to the assembling piece 62.

Further referring in combination to FIGS. 39-40, in ends of the bracingmember 601 and the bracing member 602 that are fixed to each other, anelongate through hole 6013 is formed in the bracing member 601 in thelengthwise direction of the bracing piece 60, and an the elongatethrough hole 6023 is formed in the bracing member 602 in the lengthwisedirection of the bracing piece 60. The bracing member 601 is fixed by ascrew 65 to the bracing member 602. The screw 65 can be set at anyposition within the elongate through holes 6013, 6023. In assembling,the elongate through holes 6013, 6023 are set to overlap each other andthe positions of the bracing members 601 and 602 in the lengthwisedirection of the bracing piece 60 are adjusted according to the needsfor mounting so as to adjust the positions of bumps 6012, 6022 withrespect to the assembling pieces 61, 62 (see FIG. 42) and the length ofthe bracing piece 60. After the adjustment of position, the screw 65 isset to a corresponding position between the elongate through holes 6013and 6023 and screwing is carried out to fix the bracing member 601 tothe bracing member 602. In other backup embodiments, the screws 63, 64,65 can be replaced by other fasteners, such as rivets and bolts.

As shown in FIG. 41, in the instant embodiment, the bracing piece formsat least two through holes that are spaced in the lengthwise directionof the bracing piece to replace the elongate through hole of the aboveembodiments. Specifically, in the end of the bracing member 701 that isfixed to the assembling piece 71, a plurality of through holes 7014,7015, 7016 is arranged in the lengthwise direction of the bracing piece70. A screw (not shown) can be set in one of the through holes 7014,7015, 7016 and engages a threaded hole 711 defined in the assemblingpiece 71 so as to fix the bracing member 701 to the assembling piece 71,thereby realizing position adjustment of a bump 7012 with respect to theassembling piece 71.

Similarly, in an end of the bracing member 702 that is fixed to theassembling piece 72, a plurality of through holes 7024, 7025, 7026 isarranged in the lengthwise direction of the bracing piece 70. A screw(not shown) can be set in one of the through holes 7024, 7025, 7026 andengages a threaded hole 721 defined in the assembling piece 72 so as tofix the bracing member 702 to the assembling piece 72, thereby realizingposition adjustment of a bump 7022 with respect to the assembling piece72.

Further, in ends of the bracing member 701 and the bracing member 702that are fixed to each other, a plurality of through holes 7017, 7018,7019 is arranged in the bracing member 701 in the lengthwise directionof the bracing piece 70 and a plurality of through holes 7027, 7028,7029 is arranged in the bracing member 702 in the lengthwise directionof the bracing piece 70. A screw (not shown) can be set in any of theplurality of through holes 7017, 7018, 7019 and any one of the pluralityof through holes 7027, 7028, 7029. In assembling, the positions of thebracing members 701 and 702 in the lengthwise direction of the bracingpiece are adjusted according to the needs for mounting and correspondingones of the through holes are set to overlap each other so as to adjustthe positions of bumps 7012, 7022 with respect to the assembling pieces71, 72 and the length of the bracing piece 70. After the positionadjustment, a screw is set to the overlapped position of correspondingthrough holes to carry out screwing so as to fix the bracing member 701to the bracing member 702.

In the above embodiments, the bracing piece is fixed by screws to theassembling pieces, but those having ordinary skills in the art mayeasily contemplate that fasteners, such as rivets, can be used forfixing. The present invention imposes no specific limitation in thisrespect.

The present invention also provides a bracing piece that is applicableto each of the above described embodiments and that is mounted toassembling pieces to fix a circuit board. Referring to FIGS. 42-43,assembling pieces 11171, 11172 are the various assembling piecesdescribed in the above discussed embodiments, including the primaryassembling pieces that are joined to form a main frame structure of aback frame or the secondary assembling pieces that are arranged insidethe main frame structure and joined to the main frame structure. Abracing piece 60 comprises a bracing body 11161, a first suspensionsection 11162, a first bearing section 11163, and a first resilient bentsection 11164. The bracing body 11161 is fixed to the assembling pieces11171 and 11172. In the instant embodiment, the bracing body 11161 is ofa step-like configuration and bridges between the two assembling pieces11171, 11172. However, in backup embodiments of the present invention,the bracing body 11161 can be of a straight bar like configuration orother shapes. Further, the bracing body 11161 can be fixed to theassembling piece with only one end thereof, while the other end isarranged in a suspending form to simplify mounting process.

The first suspension section 11162 extends from the bracing body 11161in a lengthwise direction of the bracing body 11161. The first bearingsection 11163 is spaced from the bracing body 11161 and extends from thefirst suspension section 11162 in a lengthwise direction of the firstsuspension section 11162. The first resilient bent section 11164 islocated between the first bearing section 11162 and the bracing body11161 and is bent from the first suspension section 11163 in alengthwise direction of the first suspension section 11162. The firstbearing section 11163 and the first resilient bent section 11164resiliently clamp a first side edge of a circuit board 80.

Referring to FIG. 43, the bracing piece 11160 further comprises a secondsuspension section 11162′, a second bearing section 11163′, and a secondresilient bent section 11164′. The second suspension section 11162′ isspaced from the first suspension section 11162 and extends from thebracing body 11161 in a sideway direction of the bracing body 11161. Thesecond bearing section 11163′ is spaced from the bracing body 11161 andextends from the second suspension section 11162′ in a lengthwisedirection of the second suspension section 11162′. The second resilientbent section 11164′ is located between the second bearing section 11163′and the bracing body 11161 and the bracing body 11161 and is bent fromthe second suspension section 11162′ in a lengthwise direction of thesecond suspension section 11162′. The second bearing section 11163′ andthe second resilient bent section 11164′ resiliently clamp a second sideedge of the circuit board 80 that is opposite to the first side edge. Ina preferred embodiment, the first suspension section 11162, the firstbearing section 11163, and the first resilient bent section 11164 andthe second suspension section 11162′, the second bearing section 11163′,and the second resilient bent section 11164′ are symmetric with respectto a center line of the bracing body 11161. In a backup embodiment ofthe present invention, the bracing body 11161 of the bracing piece 11160may comprise only the first suspension section 11162, the first bearingsection 11163, and the first resilient bent section 11164 for onlyresiliently clamping the first side edge of the circuit board 11180, andan additional bracing piece that is identical to the bracing piece 11160is provided to resiliently clamp the second side edge of the circuitboard 11180.

Referring to FIG. 43, after the circuit board 11180 is mounted, anelectromagnetic shielding piece 100 is set on the bracing body 11161.The electromagnetic shielding piece 100 is spaced from the circuit board11180 to shield electromagnetic signals generated by the circuit board11180. The electromagnetic shielding piece 100 can be a Faraday cage ora metal plate.

Referring to FIG. 42, in the instant embodiment, a bracing piece 90 thatis identical in structure to the bracing piece 60 is further provided.The bracing piece 90 is spaced from the bracing piece 60 to clampdifferent locations of the first and second side edges of the circuitboard 11180.

With the above discussed manners, the present invention provides a backframe and a backlight system, which form a back frame through joiningoperations so that a back frame has a simple structure, the materialused for the back frame is saved, and the manufacturing cost of abacklighting display device is reduced. Further, with a bracing piecethat comprises a bracing body, a first suspension section, a firstbearing section, and a first resilient bent section arranged to fix acircuit board, the expenditure of back frame mold is reduced and theproblem that a circuit board cannot be easily fixed is overcome.

With the above discussed manners, the present invention provides a flatpanel display device, a stereoscopic display device, and a plasmadisplay device that have a mold for back frame that is of a simplestructure, reduce material cost and mold cost, facilitate heatdissipation, facilitate retention of back frame, is easy to use, andfacilitate fixing a circuit board.

Embodiments of the present invention have been described, but are notintending to impose any undue constraint to the appended claims of thepresent invention. Any modification of equivalent structure orequivalent process made according to the disclosure and drawings of thepresent invention, or any application thereof, directly or indirectly,to other related fields of technique, is considered encompassed in thescope of protection defined by the claims of the present invention.

What is claimed is:
 1. A flat panel display device, wherein the flatpanel display device comprises a backlight system and a display panel,wherein: the backlight system comprises a light source, a lighthomogenization mechanism, and a back frame; the back frame carries thelight source and the light homogenization mechanism, the lighthomogenization mechanism guiding light from the light source into thedisplay panel; the back frame comprises primary assembling pieces,secondary assembling pieces, and a bracing piece for fixing a circuitboard having at least one major surface having a normal direction; theprimary assembling pieces have a number of at least two, at least one ofthe primary assembling pieces having an end forming a joint section, theat least two primary assembling pieces being joined through thecorresponding joint sections, the secondary assembling pieces beingconnected to the primary assembling pieces through joining; at least oneof the primary assembling pieces comprises a reinforcement structureformed on the joint section thereof; the at least two primary assemblingpieces comprise a primary assembling piece that has a heat sourcearranged thereon, the primary assembling piece that has the heat sourcearranged thereon having a first heat transfer capability, the remainingone or more primary assembling pieces of the at least two primaryassembling pieces that have no heat source arranged thereon having asecond heat transfer capability, the first heat transfer capabilitybeing greater than the second heat transfer capability; the bracingpiece comprises a bracing body, a first suspension section and a secondsuspension section, a first bearing section and a second bearingsection, and a first resilient bent section and a second resilient bentsection, the bracing body being fixed to the primary assembling piecesor the secondary assembling pieces or both of the primary assemblingpieces and the secondary assembling pieces, wherein available mountingpoints between the bracing piece and the primary assembling pieces orthe secondary assembling pieces are of a number of at least two so thatthe bracing piece is selectively mounted to the back frame at differentpositions; and the first suspension section and second suspensionsection extend from the bracing body to be spaced from and opposing eachother so as to define therebetween a receiving space for receiving thecircuit board therein in such a way that the first and second suspensionsections respectively engage first and second opposite side edges of thecircuit board by having the circuit board moved into the space in apredetermined direction substantially parallel to the normal directionof the circuit board, the first bearing section and second bearingsection being spaced from the bracing body and respectively extendingfrom the first suspension section and the second suspension sections tocollectively receive the circuit board to be positioned thereon, thefirst resilient bent section and the second resilient bent section beingrespectively located between the first and second bearing sections andthe bracing body and being respectively bent from the first and secondsuspension sections toward each other to define a passage having a sizesmaller than the receiving space, whereby when the circuit board ismoved in the predetermined direction substantially parallel to thenormal direction of the circuit board to reach and be positioned on thefirst and second bearing sections, the first bearing section and thefirst resilient bent section resiliently clamp the first side edge ofthe circuit board and the second bearing section and the secondresilient bent section resiliently clamp the second side edge of thecircuit board so as to clamp the circuit board between the first andsecond suspension sections of the bracing piece.
 2. The flat paneldisplay device as claimed in claim 1, wherein: the at least two primaryassembling pieces comprises a first primary assembling piece and asecond primary assembling piece.
 3. The flat panel display device asclaimed in claim 2, wherein: the joint sections comprise recesses formedin a surface of the first primary assembling piece and having a shapecorresponding to the end of the second primary assembling piece forreceiving the end of the second primary assembling piece.
 4. The flatpanel display device as claimed in claim 3, wherein the recess of thefirst primary assembling piece forms a first through hole in a bottomthereof, a second through hole being formed in the second primaryassembling piece at a corresponding position, the back frame comprisinga fastener, the fastener extending through the first through hole andthe second through hole to joint the first primary assembling piece andthe second primary assembling piece.
 5. The flat panel display device asclaimed in claim 2, wherein: the joint sections comprise recesses formedin the surface of the first primary assembling piece, the second primaryassembling piece having an end having a surface forming protrusions atcorresponding positions, the protrusions being receivable in therecesses to join the first primary assembling piece and the secondprimary assembling piece to each other.
 6. The flat panel display deviceas claimed in claim 2, wherein: the back frame comprises a third primaryassembling piece and a fourth primary assembling piece; and the firstprimary assembling piece, the second primary assembling piece, the thirdprimary assembling piece, and the fourth primary assembling piece arestraight linear and are joined in a leading end-to-tailing end manner toform a rectangular main frame structure enclosing the back frame.
 7. Theflat panel display device as claimed in claim 6, wherein: the secondaryassembling pieces comprise a first secondary assembling piece and asecond secondary assembling piece, the first secondary assembling piecehaving two ends respectively joined to at least two primary assemblingpieces of the first primary assembling piece, the second primaryassembling piece, the third primary assembling piece, and the fourthprimary assembling piece, the second secondary assembling piece havingtwo ends respectively joined to at least two primary assembling piecesof the first primary assembling piece, the second primary assemblingpiece, the third primary assembling piece, and the fourth primaryassembling piece.
 8. The flat panel display device as claimed in claim6, wherein: the two ends of the first secondary assembling piece arerespectively joined to the first primary assembling piece and the secondprimary assembling piece that are adjacent to each other and the twoends of the second secondary assembling piece are respectively joined tothe third primary assembling piece and the fourth primary assemblingpiece that are adjacent to each other; or the two ends of the firstsecondary assembling piece are respectively joined to the first primaryassembling piece and the third primary assembling piece that areopposite to each other and the two ends of the second secondaryassembling piece are respectively joined to the first primary assemblingpiece and the third primary assembling piece that are opposite to eachother, the second primary assembling piece, the fourth primaryassembling piece, the first secondary assembling piece, and the secondsecondary assembling piece being arranged parallel to each other.
 9. Theflat panel display device as claimed in claim 8, wherein: the back framecomprises at least one bracing piece, which is releasably fixed to oneor more of the first primary assembling piece, the second primaryassembling piece, the third primary assembling piece, the fourth primaryassembling piece, the first secondary assembling piece, and the secondsecondary assembling piece, the bracing piece forming a bump.
 10. Theflat panel display device as claimed in claim 1, wherein: each of theprimary assembling pieces has a cross-section of the joint section thathas a line-folded configuration in order to form the reinforcementstructure, the line-folded configuration comprising at least two joinedline segments, the reinforcement structures of the two primaryassembling pieces being stacked in a recess-projection paired form. 11.The flat panel display device as claimed in claim 1, wherein: each ofthe primary assembling pieces has a cross-section of the joint sectionthat is an arc shape to form the reinforcement structure, thereinforcement structures of the two primary assembling pieces beingstacked in a recess-projection paired form.
 12. The flat panel displaydevice as claimed in claim 1, wherein: the primary assembling piece thathas the heat source arranged thereon has a first strength, the remainingone or more primary assembling pieces of the at least two primaryassembling pieces that have no heat source arranged thereon having asecond strength, the second strength being greater than the firststrength.
 13. The flat panel display device as claimed in claim 12,wherein: the primary assembling piece that has the first heat transfercapability and the first strength is an aluminum piece and the primaryassembling pieces that have the second heat transfer capability and thesecond strength are galvanized steel pieces.
 14. The flat panel displaydevice as claimed in claim 1, wherein the bracing body forms at leasttwo through holes that are spaced in the lengthwise direction of thebracing body, the secondary assembling piece being mountable to any oneof the at least two through holes and the bracing body being fixed tothe secondary assembling piece.
 15. The flat panel display device asclaimed in claim 1, wherein the bracing piece comprises at least twobracing members, wherein at least one of the bracing members ismountable to the primary assembling piece in a lengthwise direction ofthe primary assembling piece and the other one of the bracing membersforms at least two through holes that are spaced in the lengthwisedirection of the bracing piece, the primary assembling piece beingmountable to any one of the at least two through holes.
 16. The flatpanel display device as claimed in claim 1, wherein the bracing body isof a step-like configuration and bridges between two of the primaryassembling pieces, or two of the secondary assembling pieces, or betweenthe primary assembling piece and the secondary assembling piece.
 17. Theflat panel display device as claimed in claim 1, wherein: the flat paneldisplay device comprises a touch screen, the touch screen beingpositioned on a light exit surface of the display panel.
 18. Astereoscopic display device, wherein: the stereoscopic display devicecomprises a liquid crystal lens grating, a backlight system, and adisplay panel, the liquid crystal lens grating being arranged on a lightexit surface of the display panel; the backlight system comprises alight source, a light homogenization mechanism, and a back frame; theback frame carries the light source and the light homogenizationmechanism, the light homogenization mechanism guiding light from thelight source to a light incidence surface of the display panel, and theback frame comprises primary assembling pieces, secondary assemblingpieces, and a bracing piece for fixing a circuit board having at leastone major surface having a normal direction; the primary assemblingpieces have a number of at least two, at least one of the primaryassembling pieces having an end forming a joint section, the at leasttwo primary assembling pieces being joined through the correspondingjoint sections, the secondary assembling pieces being connected to theprimary assembling pieces through joining; at least one of the primaryassembling pieces comprises a reinforcement structure formed on thejoint section thereof; the at least two primary assembling piecescomprise a primary assembling piece that has a heat source arrangedthereon, the primary assembling piece that has the heat source arrangedthereon having a first heat transfer capability, the remaining one ormore primary assembling pieces of the at least two primary assemblingpieces that have no heat source arranged thereon having a second heattransfer capability, the first heat transfer capability being greaterthan the second heat transfer capability; the bracing piece comprises abracing body, a first suspension section and a second suspensionsection, a first bearing section and a second bearing section, and afirst resilient bent section and a second resilient bent section, thebracing body being fixed to the primary assembling pieces or thesecondary assembling pieces or both of the primary assembling pieces andthe secondary assembling pieces, wherein available mounting pointsbetween the bracing piece and the primary assembling pieces or thesecondary assembling pieces are of a number of at least two so that thebracing piece is selectively mounted to the back frame at differentpositions; and the first suspension section and second suspensionsection extend from the bracing body to be spaced from and opposing eachother so as to define therebetween a receiving space for receiving thecircuit board therein in such a way that the first and second suspensionsections respectively engage first and second opposite side edges of thecircuit board by having the circuit board moved into the space in apredetermined direction substantially parallel to the normal directionof the circuit board, the first bearing section and second bearingsection being spaced from the bracing body and respectively extendingfrom the first suspension section and the second suspension sections tocollectively receive the circuit board to be positioned thereon, thefirst resilient bent section and the second resilient bent section beingrespectively located between the first and second bearing sections andthe bracing body and being respectively bent from the first and secondsuspension sections toward each other to define a passage having a sizesmaller than the receiving space, whereby when the circuit board ismoved in the predetermined direction substantially parallel to thenormal direction of the circuit board to reach and be positioned on thefirst and second bearing sections, the first bearing section and thefirst resilient bent section resiliently clamp the first side edge ofthe circuit board and the second bearing section and the secondresilient bent section resiliently clamp the second side edge of thecircuit board so as to clamp the circuit board between the first andsecond suspension sections of the bracing piece.
 19. A plasma displaydevice, wherein: the plasma display device comprises a plasma displaypanel and a back frame, the back frame being arranged at a back side ofthe plasma display panel; the back frame comprises primary assemblingpieces, secondary assembling pieces, and a bracing piece for fixing acircuit board having at least one major surface having a normaldirection; the primary assembling pieces have a number of at least two,at least one of the primary assembling pieces having an end forming ajoint section, the at least two primary assembling pieces being joinedthrough the corresponding joint sections, the secondary assemblingpieces being connected to the primary assembling pieces through joining;at least one of the primary assembling pieces comprises a reinforcementstructure formed on the joint section thereof; the at least two primaryassembling pieces comprise a primary assembling piece that has a heatsource arranged thereon, the primary assembling piece that has the heatsource arranged thereon having a first heat transfer capability, theremaining one or more primary assembling pieces of the at least twoprimary assembling pieces that have no heat source arranged thereonhaving a second heat transfer capability, the first heat transfercapability being greater than the second heat transfer capability; thebracing piece comprises a bracing body, a first suspension section and asecond suspension section, a first bearing section and a second bearingsection, and a first resilient bent section and a second resilient bentsection, the bracing body being fixed to the primary assembling piecesor the secondary assembling pieces or both of the primary assemblingpieces and the secondary assembling pieces, wherein available mountingpoints between the bracing piece and the primary assembling pieces orthe secondary assembling pieces are of a number of at least two so thatthe bracing piece is selectively mounted to the back frame at differentpositions; and the first suspension section and second suspensionsection extend from the bracing body to be spaced from and opposing eachother so as to define therebetween a receiving space for receiving thecircuit board therein in such a way that the first and second suspensionsections respectively engage first and second opposite side edges of thecircuit board by having the circuit board moved into the space in apredetermined direction substantially parallel to the normal directionof the circuit board, the first bearing section and second bearingsection being spaced from the bracing body and respectively extendingfrom the first suspension section and the second suspension sections tocollectively receive the circuit board to be positioned thereon, thefirst resilient bent section and the second resilient bent section beingrespectively located between the first and second bearing sections andthe bracing body and being respectively bent from the first and secondsuspension sections toward each other to define a passage having a sizesmaller than the receiving space, whereby when the circuit board ismoved in the predetermined direction substantially parallel to thenormal direction of the circuit board to reach and be positioned on thefirst and second bearing sections, the first bearing section and thefirst resilient bent section resiliently clamp the first side edge ofthe circuit board and the second bearing section and the secondresilient bent section resiliently clamp the second side edge of thecircuit board so as to clamp the circuit board between the first andsecond suspension sections of the bracing piece.